A Nether fortress is the Minecraft generated construction in the Nether with tunnels and bridges and dungeons/spawn cages.
The stronghold is the Minecraft generated construction in the Overworld with tunnels, libraries and an End portal.
The two do not necessarily map to each other's co-ordinates, but in order to open an End portal on a new survival world, you will have to visit both these places.
Sorontar
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